Filling: Sumptuously filled with white 100% duck feathers. Cover: Made with a 100% cotton percale cover. Mattress enhancer: Get an all natural 5cm duck feather mattress enhancer. 5cm deep: Box stitch for an even distribution of filling. Sizes: Option of a single, double, king or super king. Straps: Designed with four elastic straps to ensure it fits easily around your mattress. | All Natural 5cm Duck Feather Mattress Enhancer - Single | Wowcher